Develop -> Master merge, release v7.3.1

[mdorf]

• Fix: prevent Solr initialization from clearing index data goo#185
• Fix: stale term-search cleanup before reindexing ontologies_linked_data#290
• Fix: harden Solr indexing script safety checks ncbo_cron#129

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.10%. Comparing base (814a527) to head (d18ccba).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   78.10%   78.10%           
=======================================
  Files          66       66           
  Lines        3731     3731           
=======================================
  Hits         2914     2914           
  Misses        817      817           

Flag	Coverage Δ
ag	78.10% <ø> (ø)
fs	78.10% <ø> (ø)
gd	78.10% <ø> (ø)
unittests	78.10% <ø> (ø)
vo	78.10% <ø> (ø)

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