Cannot exec operation when not write permission on current directory.

[rubenrua]

Traceback:

Traceback (most recent call last):
  File "rr.py", line 10, in <module>
    serializer.save_in_zip(mp, location, None)
  File "/usr/share/galicaster/galicaster/mediapackage/serializer.py", line 102, in save_system_zip
    m = open(tmp_file,'w')
IOError: [Errno 13] Permission denied: 'manifest.xml'

The temp file in save_system_zip should create in a temp directory.

def save_system_zip(mp, loc, use_namespace=True):

    tmp_file = 'manifest.xml'
    m = open(tmp_file,'w')
    m.write(set_manifest(mp, use_namespace))
    m.close()