PEP8 on ABINIT parser

Branch parser_abinit_PEP8 branched off from v0.9.2 an hour ago (so it's up to date with Friday's state)

The main file of the ABINIT parser

dependencies/parsers/abinit/abinitparser/parser.py

had inhomogeneous indentations, ranging from 4-, 3-, and single-space indentations; this caused problems when editing the code. The indentation was fixed using the autopep8 tool.

I ran the tests and DOS cases again and they produce the same archive outcome.

---

There is also a minor fix to the block of code that finds the DOS file: the parser was reporting "multiple DOS files found" when there isn't any DOS file.

dependencies/parsers/abinit

-Subproject commit 748673f1fcd370cb998178653b745e69da8b906c
+Subproject commit 74651abd3196ffdd919efc5069053adb3fb16d71