increase aldor domain "get" recursion limit
re-enable arrays of types other than char; add BInt array
split && asserts for more precise runtime errors
zero-init fintAlloc'd memory; add some assertions

the zero-init should be gone, but I didn't feel like figuring out where
the real initialisation should happen
bigint.c: Allow for bigger small bigintegers (for 64 bit archs).
Add 'randomSeed' foreign function to fint.c; the aldor library uses it.
Added a very simple test framework

Test cases are expected to be self-contained programs - this probably needs
fixing so that multiple domains can be tested

Tests are run against the interpreter - they should also be run when compiled
down to executables.

Assert contains a few xUnit like assertions - it is necessarily incomplete.
fint.c: return a flag indicating if an unhandled exception is caught
emit.c: Fail immediately if fintFile call fails.

Doing this enables 'make check' to work vs the aldor libraries, which
install an exception handler.
Merge branch 'pvs/devel' into pab/algebra-unit-test