add support for staged installation of CPLEX
correct specification of 'staged_install' easyconfig parameter
correct use of 'staged_install' key
add missing shutil import
Boost: added patch for TIME_UTC

Gives troubles if glibc version is too new and Boost version is too old.
Boost: fix find glibc version
Boost: reworked patching TIME_UTC
cleanup patching out TIME_UTC, patch in patch step (not configure)
Merge pull request #8 from boegel/boost

cleanup runtime patching in Boost easyblock
Merge pull request #412 from wpoely86/boost

Boost
add comment to fix remark
Merge pull request #372 from boegel/cplex_staged

add support for staged CPLEX installation