Some improvements in vcdcd.pl
Improved vcdcd.pl (added -d option)
Fixed synthesis of functions in latched blocks
Merge branch 'bugfix'
Merge branch 'master' of github.com:cliffordwolf/yosys
Fixed to aggressive x-folding in opt_const
Removed test cases that have been moved to yosys-test.

https://github.com/cliffordwolf/yosys-tests/
added option '-Dname[=definition]' to command 'read_verilog'
Merge pull request #6 from hansiglaser/master

added option '-Dname[=definition]' to command 'read_verilog'