bzlib-src updated to 1.0.6, added bzlib-src/fixup-bzlib-src

all tests pass.
.gdbinit added
MANIFEST updated for bzip2-1.0.6, silent t/081-basic.t (again)
cc -Wall: fix unused-variables, uninitialized RETVAL, implicit-function-declaration

tested ok on win32: cl, cygwin, gcc