Changes to CMakeLists.txt to allow the system fltk to be found. These may
have interfered with static linking, as now the command lines for static
and dynamic linking look identical.
A small change to fteapot.fl so that the resulting code will compile.
Some additions to the INSTALL file to help point to prerequisites.
Fixes#1.
The XDR library is no longer in the Gnu standard library, but it can be
supplied in Tumbleweed via the tirpc library, so look for that as an
option.
Also renamed README to README.md in the packaging, to reflect prior change.
