builders: fix location of native pkgdb dir, slack-build: fix repo algorithm

slack-build now supports wider repo format (e.g. salix) instead of hardcoded
to official slackware mirror brain. slackware basesfs is updated with the new
repo URL format.
inputrc and xterm-puppy fixes

inputrc: make urxvt/xterm home/end key assignment explicit
xterm-puppy: try urxvt, if fails, then use xterm-FULL
slack-build updates

basesfs: includes libXxf86* stuff and mesa (gtk now linked to mesa)
slack-setup: update fonts.scale and fonts.dir properly, remove termcap
slack-build: remove /usr/doc too
slack pinstall.sh fixes; urxvt scrollbar default to be on the right now.
drop DejaVu fonts - this should come from parent distro.

Note: but we keep the Type1 fonts; these are URW fonts and not always
available from the parent distro.