Corrections of manual files.
Merge pull request #140 from jostber/master

FIX: Correction of typos and spelling errors in the user manual.
Fix 2 typos
fixed regexp
Merge pull request #143 from jostber/master

Fix 2 typos in comments
Merge pull request #144 from cgudrian/master

Fix: Properly detect absolute file names on Windows.
New: 'headcount' now ignores resources that are marked as unemployed.
Merge branch 'master' of github.com:taskjuggler/TaskJuggler
Updating GPL v2 to latest version
Merge branch 'master' of github.com:taskjuggler/TaskJuggler