removed mahara packages from plan, added deps

rational:
    - mahara packages are no longer available from debian
    - to be installed from upstream source
download mahara tarball from upstream
rewrote conf to use upstream tarball + cli installation
updated apache conf for new webroot
added passwordsaltmain to config (security)
updated secret regen for new config path and added sitesalt
updated inithook for password encryption changes in new mahara version
added cron job configuration