calc: C-style arbitrary precision system Files

The following are the changes from calc version 2.12.5.5:

    Improved the jacobi help page.

    Rewrote gen_v1() in the lucas.cal resource file using the method
    based on a paper:

 	"A note on primality tests for N = h*2^n-1", by Oystein J. Rodseth,
	Department of Mathematics, University of Bergen, BIT Numerical
	Mathematics. 34 (3): pp 451-454.

	http://folk.uib.no/nmaoy/papers/luc.pdf

    The improved gen_v1() function is capable of returning a value
    for all valid values of h and n.  As a result, the trial tables
    used by gen_v1() have been changed to a short list of values
    to try, in order ot likelyhood of success, before doing an
    enhaustive search for a v1 value to return.

    Removed lucas_tbl.cal calc resource file.  This file was made
    obsolete by the above rewrite of the lucas.cal resource file.
    This file will be removed from the local cal directory and
    from CALC_SHAREDIR during a 'make install', 'make cobber',
    and 'make uninstall'.

    Renamed gen_u0() to gen_u2() in lucas.cal.  Provided a gen_u0()
    stub function that calls gen_u2() for backward compatibility.

    The old gen_v1() method used by the Amdahl 6 group has been
    renamed legacy_gen_v1() in lucas.cal.  This function is no
    longer usde by the lucas(h, n) function to test the primality of
    h*2^n-1.  It is preserved in lucas.cal for historical purposes.

    The 'make clobber' rule will attempt to remove all files that
    start with libcalc and start with libcustcalc.

    The 'man' command is now an alias for the 'help' command.

    Fixed extra /'s that were put into CALCPATH because of ${T}.
    Fixed extra /'s that were compiled into HELPDIR and CUSTOMHELPDIR.

    The fix in 2.12.5.4 to to prepend ${T} in front of the CALCPATH
    path components ${CALC_SHAREDIR} and ${CUSTOMDIR} broke the
    calc rpm build process.  The check-buildroot tool discovered
    that the BUILDROOT directory had been improperly put into various
    paths and binaries.  This has been fixed in 2.12.5.5.