new: checker.MP2T, client.findfiles, tools.reidentify

new:
checker.MP2T:
Checker for MTS-Files: every 192 bytes there has to be an "G".
Currently not implemented in the upload, because it has to know, which files are
MTS-Files.
TODO
+TODO: proper modular api for during-upload-checks

client.findfiles:
Goes recursiv through a dir and returns an array with all found files with an
ending from endings.

tools.reidentify:
Runs identify on every given fileid with the data from the database.
No events are being deleted from files.

changes:
client.py takes now one dir as second argument, no files.
db.indexevent kan now delete not specified events when running on already
 identified files.
Databases in tools.py are now being properly closed.
When uploading files, the path is now being wrote to the Database befor
 uploading the file.

Sorry for that much. ;)