update release notes for EasyBuild v1.8.2

port thread pool patch to PSI 4.0b4, and use it to fix 'hanging' tests

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.