Usage:

Starting from an empty directory:

(1) set AS to point to the location of ABC

(2) reconstruct the directory structure of ABC in the new directory:

    mkdir -p `cd $AS && find src -type d`

(3) Build ABC:

    make -f $AS/Makefile VPATH=$AS ABCSRC=$AS

bridge relates: (1) fix netlist reader to read the latest version written by ZZ, (2) replace printf() with Abc_Print() in pdr so that it will not interfer with bridge messages