eliminates some more of compiler warnings: "unused result value"
improved (standalone!) header for polynomials (polys/monomials/monomials.h)

chg: moved the basic primitives for accessing and setting fields of a poly from p_polys.h into monomials.h
NOTE: these basic functions either do NOT need a ring or are macros (or both)

chg: no need to include coeffs/coeffs.h and polys/monomials/ring.h in polys/monomials/monomials.h
NOTE: just forward-declare structures and typedef pointers at them.

chg: minor cleanup of includes in p_polys.cc
Abstract iterator/enumerator interfaces + dummies for ClearContent and ClearDenominators
implementing PolyCoeffsEnumerator: enumerator for simple iteration over coefficients of a (non-zero) polynomial.

add: added dummy stubs for calling n_ClearContent and n_ClearDenominators from p_Content and p_Cleardenom
Added stubs for putting the actual code (TODO!), where required (i.e. described) by Hans

chg: descriptions for the output number (n_ClearContent & n_ClearDenominators)
chg: publicly available default implementations ndClearContent & ndClearDenominators for fallback calls
make Singular resources available by default if running directly from build tree

NOTE: correct Singular environment is produced by 'make install'!
fixing the build system as suggested by autoreconf & fixing the fix

add: AM_PROG_AR&-Wno-extra-portability&-Werror are commented out for now due to problems with incompatible autotools :(
add: usefull autotools flags (subdir-objects silent-rules)
chg: removed some minor warnings
minor fixes in omalloc
added C++ demangling and more debug output
moved the definition of p_GetShortExpVector(poly, ring) to p_polys.cc
fix due to sqrfree return type change (ideal -> list (ideal, intvec) )
fixing bugs due to rChangeCurrRing(0)

TODO: why all of this was commented out???!
further deprecation of MP-related stuff!
removal of the dirty "include gmp.h without C++ declarations" hack

NOTE: the hack messes up any later STD C++ library inclusions since one has to include bits/c++config.h before un- or re- defining __cplusplus
added autoconf tests for cxxabi.h and execinfo.h in order to use backtrace* and abi::__cxa_demangle
enable loading of 64-bit Mach-O bundles
fix: tr 439
chg: new command igcd to compute integer gcd
fix: tr 440
chg: deleted @internal