sync with develop + fix linking to ncurses in libreadline 7.0 easyconfig using GCCcore/6.4.0

bump version for libyaml, SQLite & Tcl easyconfigs that use GCCcore/6.4.0

remove bare Python easyconfig using GCCcore/6.4.0 toolchain + easyconfigs that require it

bump version for various easyconfigs that use GCCcore/6.4.0

Use `buildopts` instead, see http://www.linuxfromscratch.org/lfs/view/8.0/chapter06/readline.html

bump version for cURL, libsodium and FreeXL easyconfigs that use GCCcore/6.4.0, remove non-dummy Eigen easyconfig (headers only)

Update ncurses to not build a separate libtinfo but provide a soft link instead. Force linking to ncurses in libreadline

{chem}[intel/2017a] NWChem v6.6.revision27746

when using dummy

Update ncurses to not build a separate libtinfo but provide a soft link instead. Force linking to ncurses in libreadline

{tools}[dummy/] Lucene-Geo-Gazetteer v20170718

{lib}[dummy/] Tika v1.16

include timereg as extension in R 3.4.0 easyconfig

avoid that /Users/kehoste/.m2 is abused by Maven when installing OpenNLP

{lib}[dummy/] OpenNLP v1.8.1

{tools}[dummy/] OpenRefine v2.7