* Sets module search path to file directory for slang/verilog linter
Similar to iverilog behaviour.
See 699c0dbe80
Reasonable default behaviour, can be changed by adding '-y%s:h' to
`b:ale_verilog_slang_options` buffer variable.
* Adds filename to slang/verilog linter output
slang can parse other files based on the modules instances names find in
the current file and returns warning/error messages related to those
files that have the same pattern.
Adding the file name to the outputs avoid polluting the active buffer
with those messages.
* Absolute paths in slang/verilog linter messages
Otherwise temp files are not correctly detected
