Fix issues discovered in beta release v1.2.0

[rogerfraser]

Overview

This pull request introduces the following fixes and enhancements:

Fixes

• Fix an issue in import relating to the renaming of sites with discontinuities and every occurrence of a discontinuity site in the imported measurements (identified by @harry093 in discussion Beta release v1.2.0 of DynAdjust #149).
• Fix a defect in FindXercesC.cmake, where installation failed to find a pre-existing installation of xerces-c in /opt/xerces-c/3.1.4
• Fix issue Deflection of vertical correction incorrectly applied to zenith angles #160 and update corresponding formula in DynAdjust User's Guide
• Fix an issue in adjust relating to archiving the estimated station uncertainties for simultaneous adjustments to *-rva.mtx. This defect led to strange values for SD(e), SD(n) and SD(up) in *simult.adj files when executing adjust in report results mode (i.e. --report-results)

Enhancements

• Minor improvements to comments
• Remove unused code
• Minor code enhancements

[coveralls]

Coverage increased (+0.9%) to 82.143% when pulling 213ed3e on rogerfraser:master into dacfbae on icsm-au:master.

[codecov]

Codecov Report

Merging #162 (213ed3e) into master (dacfbae) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   82.34%   82.37%   +0.02%     
==========================================
  Files         117      117              
  Lines       32464    32448      -16     
==========================================
- Hits        26734    26729       -5     
+ Misses       5730     5719      -11     

Impacted Files	Coverage Δ
dynadjust/dynadjust/dnaadjust/dnaadjust.cpp	89.15% <100.00%> (-0.01%)	⬇️
dynadjust/include/io/dnaiosnx.hpp	100.00% <100.00%> (ø)
...nadjust/include/measurement_types/dnadirection.cpp	89.87% <100.00%> (+0.07%)	⬆️
...ust/include/functions/dnatemplatedatetimefuncs.hpp	83.84% <0.00%> (-0.49%)	⬇️
dynadjust/dynadjust/dnaadjust/dnaadjust.hpp	96.36% <0.00%> (+1.81%)	⬆️
...t/dynadjust/dnaadjustwrapper/dnaadjustprogress.cpp	76.79% <0.00%> (+4.97%)	⬆️

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