Add files via upload

Add release notes for versions 1.2.0 - 1.5.0.

docs/source/release/1.2.0-notes.txt

@@ -0,0 +1,25 @@
+CorpusTools 1.2.0 Release Notes
+*******************************
+
+Version 1.2 was released in December 2016. 
+
+Inventory Management
+====================
+
+* The tools for categorizing segments into an inventory chart have been updated to allow users to interactively update the chart based on nature classes, including the ability to add / delete / rearrange columns and rows in the chart. Uncategorized segments are more clearly shown and their features easily examined for reference.
+
+
+Environments
+============
+* Environments can be more flexibly defined, e.g., using wildcards and inserting / modifying / deleting segments or classes of segments within a linear string. 
+
+
+Functional Load
+===============
+* Within the functional load analysis, functional load can be calculated within individual sets of environments rather than exclusively at the word level.
+
+
+Other
+=====
+
+* Numerous small updates have been implemented to aid usability, such as improving the ability to select segments based on features, returning results that list features if those were used in the selection of segments, updating the documentation for clarity, adding an option for normalizing functional load results, etc.

docs/source/release/1.3.0-notes.txt

@@ -0,0 +1,21 @@
+CorpusTools 1.3.0 Release Notes
+*******************************
+
+Version 1.3 was released in July 2017. 
+
+New features
+============
+
+* Implemented an algorithm for calculating informativity.
+
+
+Functional Load
+===============
+
+* The options for relativizing functional load have been revised and clarified.
+
+
+Other
+=====
+
+Numerous small usability fixes have been included.

docs/source/release/1.4.0-notes.txt

@@ -0,0 +1,23 @@
+CorpusTools 1.4.0 Release Notes
+*******************************
+
+Version 1.4.0 was released in December 2018. 
+
+New features
+============
+
+* Support for syllable structure has been added to the software, allowing searches based on stress or tone.
+
+
+Functional Load
+===============
+
+* The functional load algorithm based on minimal pair counts has been FIXED -- previous versions returned counts based on token frequencies instead of type frequencies.
+* Functional load calculations with right-hand environment specifications should be working.
+
+
+Feature Systems
+===============
+
+* The feature values in the pre-included feature systems have been updated to fix corruption issues.
+

docs/source/release/1.4.1-notes.txt

@@ -0,0 +1,4 @@
+CorpusTools 1.4.1 Release Notes
+*******************************
+
+Version 1.4.1 was released in September 2019. This version sizes inventory tables in a more appropriate way, includes the version number in output tables for archival purposes, and fixes bugs in the phonological search, functional load, and "About PCT" functions.