Re: tests: test -i/--inplace with backup suffix option

[Assaf Gordon]

Hello,

Attached are improved (and expanded) tests.
Fixed the 'tty' issue, and quoted here-docs.
The tests should now cover most of the 'compile.c' file (without multibyte 
sections).

Also, attached four small changes to sed itself:
* sed: allow multiple (non-conflicting) -E/-r parameters
* sed: adjust line-ending of F/l/= commands with -z
* sed: reject 's///e' in --posix mode
* sed: standardize exit code values
These might be a bit more controversial, so can be put for later...

Comments welcomed,
 -assaf

sed-tests-2016-05-30.patch.xz
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sed-changes-2016-05-30.patch.xz
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