Merge branch 'master' into develop
allow SLAX_EXTDIR environment variable to override the builtin extension library
allow SLAX_EXTDIR environment variable to override the builtin extension library
make anchor when none are given
teach oxtradoc to handle "!!include-file foo.txt"
new "!! list-sections" feature
fixes for clang and gcc49, and for mavericks
make URLs into erefs
add gcc test
add gcc test
add gcc test
add gcc test
move from old gcc structure field assignments to modern new ones
add gcc test
add gcc test; don't invoke BISON twice
avoid insanely odd gcc-on-mavericks warning when too much auto data is on the stack (ld: warning: could not create compact unwind for _slaxExtDampen: stack subq instruction is too different from dwarf stack size)
make unused intermediate nodes
avoid clang warning with slaxEltArgCallPref (by making it non-static; ick)
add gcc test
add missing free calls