fix(package) fix empty PACKAGE name (refs #3526)

Corrected the regression introduced by the previous commit for #3526 which left
the @PACKAGE@ empty as it is declared before `AC_INIT(…)` in `configure.in`.
fix(package): Rename ckeditor_install to htmledit_install (refs #4445)

Rename `programs/ckeditor_install` to `programs/htmledit_install` to
prevent conflict with `programs/ckeditor_install` bundled by
`dynacase-ckeditor-installer`.
fix(package): Change install dir to `share/offline/ckeditor` (refs #4445)

"dynacase-htmleditor" would unpack ckeditor into the same dir
(`ckeditor`) as "dynacase-ckeditor". The unpack dir for
"dynacase-htmledit" as been changed to a distinct
dir (`share/offline/ckeditor`).
Merge pull request #8 from eguaj/3.2-A3526

Changed install dir to `share/offline/ckeditor` (closes #3526)(closes #4445)