drop this module, it should be layers of mfext

[thefab]

the split between mfext and mfcom is historical and has no sense today since metwork framework is completly open source

Prerequisites:

• [x] move synutil_c into mfutil_c
• [x] move synutil_lua as an independent repository

[thefab]

we propose to use following layer names:

• misc@mfext (current adm content)
• python3_misc@mfext
• python2_misc@mfext

[thebaptiste]

Done