Changelog: list key updates since previous tagged release

ChangeLog

@@ -1,34 +1,68 @@
+2024-02-29  Steve Morley <smorley@lanl.gov>
+    * Release: v2.0.0-alpha
+
+    * Continuous integration: Migrated to GitHub actions
+
+    * Installation: Perl extension disabled by default (--disable-perl argument removed from configure). To enable perl extension, use --enable-perl
+
+    * IGRF: Updated to DGRF12/IGRF13. Update extrapolation to use secular variation.
+
+    * Lgm_QinDenton: Extra checks in Lgm_QinDenton to reduce unnecessary output and check for inputs with standard QD naming convention ([1min, 5min, hour], in that priority order)
+
+    * New functions: Lgm_Terminator, FluxTubeVolume, Lgm_ReplaceSubString2, Lgm_B_FromScatteredData6 added to library
+
+    * Experimental Gaussian Process Regression functionality added to library
+
+    * Updates to enable second-order evaluation of fist adiabatic invariant
+
+    * magstep: Bulirsch-Stoer relative tolerance set to zero by default (only use absolute error)
+
+    * API change: Add RelaxTolerance argument to FindShellLine
+
+    * API change: Add ErrorStatus to all function variants of ComputeI_FromMltMlat
+
+    * TA16: Tsyganenko-Andreeva 2016 model added. Currently requires TA coeficient input files.
+
+    * TS04: Trap added for clean return if evaluating deep inside Earth
+
+    * JensonCain1960: New internal field model added
+
+    * Bug fixes: Correct altitude for lambda integrand in L* calculation, Correct angle in Lgm_EarthEclipse, Correct intersection calculation for Lgm_Ellipse
+
+    * Other: Preliminary version of field-aligned (PQB) coordinates, expanded KdTree functionality, updates to various examples, tests updated for expected changes, numerous minor documentation updates, etc.
+
+
 2018-03-09  Steve Morley <smorley@lanl.gov>
-        * Release: v1.5.16
+    * Release: v1.5.16
 
-        * tests: revised and expanded test suite, github repo set to use Travis
-        CI
+    * tests: revised and expanded test suite, github repo set to use Travis
+    CI
 
-        * Lgm_QinDenton: updated defaults, changed handling of missing data
-        files
+    * Lgm_QinDenton: updated defaults, changed handling of missing data
+    files
 
-        * Lgm_Ellipsoid: added shapes, intersections, etc.
+    * Lgm_Ellipsoid: added shapes, intersections, etc.
 
-        * Tools: Command line utils for Magnetic Ephemeris files and Last 
-        Closed Drift Shell calculation
+    * Tools: Command line utils for Magnetic Ephemeris files and Last 
+    Closed Drift Shell calculation
 
-        * ViewDriftShell: Updates to improve portability and UI
+    * ViewDriftShell: Updates to improve portability and UI
 
-        * ComputeLstar: Behavior in Shabansky orbits now set by flag in 
-        LstarInfo struct
+    * ComputeLstar: Behavior in Shabansky orbits now set by flag in 
+    LstarInfo struct
 
-        * Lgm_CTrans: Added JPL DE421 to obtain Sun vector (now have DE, high 
-        accuracy and low accuracy)
+    * Lgm_CTrans: Added JPL DE421 to obtain Sun vector (now have DE, high 
+    accuracy and low accuracy)
 
-        * TS07: TS07 magnetic field model fully enabled. Requires coefficient
-        files in same location/format as IRBEMlib.
+    * TS07: TS07 magnetic field model fully enabled. Requires coefficient
+    files in same location/format as IRBEMlib.
 
-        * Other: More changes since this file was last updated than can be 
-        encapsulated here. OSS release and GitHub hosting means that commit 
-        history is now publicly available.
+    * Other: More changes since this file was last updated than can be 
+    encapsulated here. OSS release and GitHub hosting means that commit 
+    history is now publicly available.
 
 2011-07-08  Mike Henderson <mghenderson@lanl.gov>
-        * configure.ac: added LGM_INDEX_DATA_DIR to locate where to find index data (e.g. Kp, Dst, AE). 
+    * configure.ac: added LGM_INDEX_DATA_DIR to locate where to find index data (e.g. Kp, Dst, AE). 
 
 2011-04-25  Mark Galassi  <markgalassi@lanl.gov>
 	* configure.ac, lanlgeomag.spec.in: started maintaining a .spec.in