release EasyBuild v1.8.1

bump version to v1.8.1.0, update release notes

fix easyconfig file names w.r.t version suffixes

Psi 4.0b5

* 'psi' of https://github.com/boegel/easybuild-easyconfigs:
  remove respecifying default max_fail_ratio of 0.5 in NWChem easyconfig
  really fix typo in patch file
  fix typo in patch file
  complete mpi patch file for PSI-4.0b5
  align PSI easyconfigs, correct filename of -mt PSI goalf easyconfig, add mpi PSI goalf easyconfig

Conflicts:
	setup.py

fix faulty easyconfig file names

Hang should be fixed now.

 I've added two env vars to the configure script: one for the install
 directory for the source and one for the install directory of the
 objects.

A variable is changed without proper mutex locking.

 I've added two env vars to the configure script: one for the install
 directory for the source and one for the install directory of the
 objects.

release EasyBuild v1.8.0.0

update release notes, bump to v1.8.0.0