add easyconfigs for Mono, MyMediaLite and IronPython

It builds a part that only works for AVX or AVX2, so don't force -xHost
on it (it will cause failures).

--minimal-toolchains will use subtoolchains automatically.

New easyconfigs for Imod 4.7.12 and Imod 4.7.15

{data}[intel/2016b] DBD-mysql v4.033, MariaDB v10.1.17, jemalloc v4.2.1

significantly speed up verifying of dumped easyconfig by resorting to 'shallow' parsing

{chem} [intel/2016b] Libint 2.1.0 (REVIEW)