Previously, a file path beginning with "/", "./", or "../" would be
searched for verbatim and no searching would be done over paths.
This behavior now occurs for a leading "/" only. File paths with
"./" or "../" will search for the file with the path verbatim, then
proceed to search for the file with each search path prepended to
the filename as usual. This solves a problem for reusable, non- PDK
IP blocks, where the IP block may have an abstract view pointing to
a GDS file which is specified as being located at "../gds/<file>".
This file would not be found if the IP block was included into
another project. Now it can be done if the path to the IP is given
by "addpath".
Tim Edwards
0c36365db8