Fix --add-comments breakage in default parser configs.
Fix --add-comments breakage in default parser configs.

Commit 025eccd12e1167ab42ae6db4000290e7d6d494e8 incorrectly omitted
space before --add-comments flag.  This resulted in broken scanning of
sources for anybody who installed a new install of 1.5.6 (as opposed to
upgrading from previous versions).

Correct this and also include code to automatically fix borked
configurations.

Fixes #536.

dwaynebailey/poedit,vslavik/poedit,dwaynebailey/poedit,huoxudong125/poedit,huoxudong125/poedit,PatidarWeb/poedit,vslavik/poedit,vslavik/poedit,BenKeyFSI/poedit,PatidarWeb/poedit,babycaseny/poedit,PatidarWeb/poedit,nawawi/poedit,huoxudong125/poedit,huoxudong125/poedit,alexhenrie/poedit,babycaseny/poedit,nawawi/poedit,dwaynebailey/poedit,c72578/poedit,PatidarWeb/poedit,BenKeyFSI/poedit,alexhenrie/poedit,BenKeyFSI/poedit,BenKeyFSI/poedit,c72578/poedit,huoxudong125/poedit,egoitzro/poedit,c72578/poedit,nawawi/poedit,alexhenrie/poedit,PKRoma/poedit,nawawi/poedit,vslavik/poedit,egoitzro/poedit,vslavik/poedit,c72578/poedit,egoitzro/poedit,alexhenrie/poedit,dwaynebailey/poedit,BenKeyFSI/poedit,PatidarWeb/poedit,PKRoma/poedit,PKRoma/poedit,PKRoma/poedit,c72578/poedit,nawawi/poedit,babycaseny/poedit,alexhenrie/poedit,babycaseny/poedit,babycaseny/poedit,egoitzro/poedit,dwaynebailey/poedit,egoitzro/poedit,PKRoma/poedit