[config] disable fckeditor by default (closes #1368900)
FCKEditor is no longer maintained, and has a history of XSS issues.
Let's use plain text as default text format.
usr/lib/PY_VERSION/*-packages/cubicweb/server/
usr/lib/PY_VERSION/*-packages/cubicweb/hooks/
usr/lib/PY_VERSION/*-packages/cubicweb/sobjects/
usr/lib/PY_VERSION/*-packages/cubicweb/schemas/
usr/share/cubicweb/migration/