[mms-lib] Cleaned up mms_codec test

No functional changes.
[test_mms_codec] Allow to specify file name from the command line
[mms_codec] Fixed decoding of the From field

The text it may contain must be treated as Encoded-string-value
Merge pull request #25 from monich/from-field

[mms_codec] Fixed decoding of the From field
Version 1.0.10