fix possible file truncation while generating dependencies

new Tcl/Tk extension packaging policy

.spec: do not require rpm-build (express the compatibility with
.spec: use standard %_rpmmacrosdir for the macros according

modified for use with tm modules, found in tcl8.5

do not require /usr/bin/tclsh to not create circular deps

added new files, for use with new rpm-build:
will select tcl files for req/prov
piece of rpm-build scriplets' preamble
build tcl macros to /etc/rpm/macros.d/tcl
tcl.req: enabled warning when "eval source" fails

%teapatch macro resurrected

#6488 again

#6488 fixed

catched 'exit' in scripts, which can abort findreq process

added conflicts to older tcl-devel

Initial release