Fix MimeTypes -> MimeType in .desktop file,

so that docear gets registered as application for text/x-docear files.
Fix MimeTypes -> MimeType in .desktop file,

so that JabRef gets registered as application for text/x-bibtex files.
Use
LockFile "/var/run/accept.lock"
instead of previous
LockFile "/var/log/accept.lock"

If system is crashed and rebooted, Apache refuses to start in case
/var/log/accept.lock.<pid> is found. That <pid> is almost always the same
due to minimum pid variance right after boot.
So use /var/run instead, which is cleaned on each boot.