[developers] revamped pet build system

[Peter Adolphs]

Hi!

I've checked in several modifications to the pet build system. It should be more 
robust (e.g. in finding the right ECL and LOGON installation) and more standards 
compliant. For example, configuration parameters such as CXX optimization flags 
that are passed as a configure command-line parameter are now respected. This is 
very handy if you want to test different configurations in separate build 
directories (e.g. mkdir -p build/debug && ../../configure "CXXFLAGS=-g -O0").

There are 2 new directories in pet that are now needed for configure.ac: 
"build-aux" for all the helper scripts used by autoconf/automake and "m4" with 
local m4 macros. Because of this, it is necessary to run the following command 
after svn checkout/update:

   autoreconf -i

Any feedback is welcome!

Peter

-- 
Peter Adolphs
DFKI GmbH, Projektbuero Berlin, Rosenstrasse 2, D-10178 Berlin
Telefon: 030 / 24 31 02 - 183
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