version-3.50.2
Another minor formatting fix.
Fix utility compilation issues with MSVC.
Fix another problem with ".expert" and virtual tables. [forum:/forumpost/49d6a19ec|Forum post 49d6a19ec].
Approximately 100 typo corrections spanning the whole tree, submitted via [forum:0db9827f0464bc33|forum post 0db9827f0464bc33] and individually audited and verified. Affects only code comments, innocuous test strings, error message text in tool (not library) code, and configure-level help text.
Add header guard to the expert extension.
Cygwin-centric fixes from Jan Nijtmans.