Better printing of cpp command in verbose mode.
Fix detection of tcl in configure script

Instead of manually looking for tcl.h and libtcl.so, use the appropriate
variables from tclConfig.sh. This is more robust and fixes in particular the
configure on Ubuntu-13.04/amd64.

While here, drop tcl8.3 and add tcl8.5 in the default list of automatically
searched directories. On amd64, still look into /usr/lib in addition to lib64,
since all linux distributions have been iterating through all possible naming
strategies of the 'lib' directory on 64bits archs.
Enable parallel builds

Add a '+' to the recursive rules where the ${MAKE} variable is hidden inside
another variable.

See http://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html#MAKE-Variable
recent commits
Genom 2.11