Multicharacter delimiters + non-UTF8 encoding doesn't work correctly in parsers

[wesm]

The new C parser handles user-specified encoding properly. The Python parser not so much (I think it may only be an issue when regular-expression parsing is used).

[gfyoung]

@jreback : is it me, or is this no longer an issue? The common.py tests have several encoding ones.

[jorisvandenbossche]

But I don't see directly any test with the combination of an encoding and a multi-character sep? (so maybe we should add a test for that?)