Use semantic -mdoc macros for the manpage.
Fixing a usuability issue where clicking 'escape' would shutdown the game with the Options menu open.
Merge pull request #378 from authenticate/upstream

Fixing a small issue with the Options Menu in Boot Mode
Merge pull request #377 from bentley/master

Use semantic -mdoc macros for the manpage.
Refreshed a bit the doc in the manpage.
While seeing it, tweaked the readme.md a bit.
Corresponding tweak in the Readme simple text file
Typo fix in end credits.

Thanks to Nemesis for spotting that one. :)
Russian translation fix by dimproject.
Incorporating the precompiled header into the map editor build.