Add tests for splitnets command
Expand coverage for trace command
Expand coverage for splice command (tests for options)
Expand coverage for scc command (different loops)
Expand coverage for rename command
Change test for passes/techmap/deminout
Update test for 'dff2dffe -direct' command
Add test for 'dffsr2dff' command
Expand coverage for iopadmap command

backends
=======
1. backends/firrtl/firrtl.cc – skipped because of error:
 ERROR: Unclocked write port 0 on memory top.ram.
Add model with memory block too, so you can cover line block starting at
line 419

simple
=========
+ 1. passes/techmap/attrmap.cc
There is example in help block create example with
(* keep="true" *) attribute and run example

+ 2. passes/techmap/dff2dffe.cc
execute with  -unmap parameter

+ 3. passes/techmap/dff2dffs.cc

+ 4. passes/techmap/extract.cc
Lot of variations of input parameters is not excersised

? 5. passes/techmap/extract_counter.cc
This is specific to greenpak4 architecture, but idea is to have counter
in design and call this after synth_greenpak

+ 6. passes/techmap/shregmap.cc.
This also seams to be greenpak4 specific, but extracting shift register

misc
========
1. passes/techmap/insbuf.cc

Testing problems:
1. backends/firrtl/firrtl.cc – skipped because of error:
 ERROR: Unclocked write port 0 on memory top.ram.
Add model with memory block too, so you can cover line block starting at
line 419
2.dff2dffe -direct - skipped: ERROR: Found error in internal cell
\dffe.$procdff$47 ($dffe) at
3.insbuf -buf $_BUF_ in out - skipped: ERROR: Found error in internal
cell

Signed-off-by: Clifford Wolf <clifford@clifford.at>