ID:	  N-010

Proposed by:  David Bishop  03/05/2004
Analyzed by:  
Resolved:     

Summary:  
    Minor changes to the numeric packages

Detail:
    1) Added functions "add_sign" and "remove_sign" to convert between
       SIGNED and UNSIGNED types. "add_sign" would add a '0' sign bit
       and increase the vector by 1 bit. "remove_sign" would do an "abs"
       and remove the sign bit, shrinking the vector by 1 bit.
    2) Modify all of the "asserts" from the package to be of the format
       assert XXX report "NUMERIC_STD.Function: error message".
       So that you can tell what function/package the error is comming from.
    3) Add aliases for the "to_StdLogicVector" function which are "to_slv"
       and "to_std_logic_vector".
    4) Add aliases for the "to_StdULogicVector" function which are "to_sulv",
       and "to_std_ulogic_vector".
    5) Add aliases for the "to_bitvector" function which are "to_bv" and
       "to_bit_vector"
    6) Modify the "end" for each function and procedure to read
       "end function function_name" and "end procedure procedure_name".

Analysis:
[To be performed by the Working Group]

Resolution:
[To be determined by the Working Group]