Add $(SUPPORTURL) to build to create 'support_url=' entry in INFO file of package.
This allows a support URL to be specified in the Makefile for a package using the variable: '$(SUPPORTURL)' which is then added to the package's INFO file. This will then display a support link in the DSM Package Center.

(cherry picked from commit 5d0b8d32bcb89c0fa623d34e6d2cbdb4e8895227)
Change $(HELPURL) to $(SUPPORTURL)
Move help page and add to Makefile
Improve overview screen of app
Revised app UI so that update=refresh and upgrade=update
This is more applicable to Gentoo, rather than the `aptitude update`/`aptitude upgrade` procedure.
Update help page
Typo in direct.py
Typo in HELPURL
Change SUPPORTURL to https://github.com/MasterRoot24/spksrc/issues
Check that log file exists and exit 1 if not found