scm: cvs: use "-D time_to_cvstime_rlog(identifier)" in adapter entries().
scm: cvs: code clean up adapter entries().
scm: cvs: use scm_cmd() in adapter revisions().
scm: cvs: code clean up model.
scm: cvs: use scm_cmd() in adapter entries().
scm: cvs: add new method 'scm_cmd' to wrap shellout.
Refer Mercurial adapter r4830.
scm: cvs: code clean up functional test.
Speeds up WikiHelper#wiki_page_options_for_select.
Code cleanup.
