libslax-0.16.18

• Add spec file to EXTRA_DIST
• Build file for travis-ci.org
• oxtradoc: add "{{plain:" and "{{quote:" modes; like digress, but simpler
• add 'make install' for oxtradoc
• add CONFIGURE_OPTS
• add docdir entries
• add docs for --show-select and --show-variable
• add unused xmlIsReserved() function
• gt: don't bother running an editor during merge-from
• oxtradoc: error for missing -m mode
• gt: error if missing branch name for merge-from and merge-to
• fix 'rm' for oxtradoc
• fix for ".01"; floating point numbers don't need a leading '0'
• fix json docs
• incorporate yang/bin/outline2xml changes upto r3779 (Oct 2012)
• new command line options: --show-select and --show-variable
• gt: print branch name during checkin
• report error if a prefix is not found
• use DESTDIR