Riscof

- Fixed ISA check typo for 64-bit K extension tests and database.yaml
- Fixed the issue pointed out in 53. Now riscof will through an error if test_list.yaml is empty and will not proceed furthur.

- Added env argument to the cli.
- printing versions of isac and confing in log for better debugging
- fixed issues pointed out in 51
- fixed regex conditions for cebreak tests and also updated database
- Updated tests based on latest coverpoints.

- work directory is now controlled by user args. Defaults to riscof_work for backward compatibility.
- when filtering we check the config string in the cgf. The config node can have multiple entries.
If within an entry multiple conditions are detected, then they are andded to create included_entry.
Across all the list of entries in the config list the included_entries are ORed.

- Added new rv64i and rv32i tests from arch-test repo
- Added K_unratified tests from arch-test repo
- Addded all relevant coverage files
- Updated coverage support to pick local coverage files
- Updated setup phase to dump out sail_cSim reference model
- Updated the config.ini and model setup files
- Updated docs

- Fixed missing coverage.html during pip installation.

- Added support for paths relative to `config.ini` location
- Plugins get the location of `config.ini` directory with the key `config_dir`