Yaslha

- rewrite full code structure
- change all the interfaces
- upgrade marshal scheme to 3

Now yaslha is maintained with [Poetry](https://poetry.eustace.io/) and [distributed on PyPi](https://pypi.org/project/yaslha/)!

New module feature:

- introduce `SLHA.__getitem__`
- tweak `Decay` interface

New script feature:

- add `yaslha-extract` to extract some blocks from a SLHA data.

with several debugs.

New features as using a module:

- add `yaslha-merger` to merge/overwrite/modify SLHA data with another patch.

with several debugs.

(and unfortunately more complexity....)

New features as using a module:
- allow parse/dump files directly with yaslha.parse_file and yaslha.dump_file
- add accessor methods to SLHA
- (debug) allow Block.get without arguemnt for no-index-lines
- add minor-format options to SLHADumper
- allow to configure in cfg file

New features for the converter:
- add minor-format options to SLHADumper
- allow to configure in cfg file

with several debugs and refactorings.

With [tests integrated with Travis-CI](https://travis-ci.org/misho104/yaslha), now `yaslha` is compatible with Python 3.4+.