ed: initial support for global (g) command

[mknos]

• Basic usage of g command is to show lines matching a pattern
• More advanced use of g command would be to modify the buffer; this needs more work
• test1: g/text not found/p ---> no error is printed (consistent with BSD and GNU version)
• test2: g/include/p ---> print matching lines
• test3: g/include/n ---> prefix matching lines with line number
• test4: g/t/l ---> matching lines are listed in with escapes

[coveralls]

Pull Request Test Coverage Report for Build 11413296434

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 73.069%

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Totals
Change from base Build 11408363703:	-0.7%
Covered Lines:	350
Relevant Lines:	479

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💛 - Coveralls

[briandfoy]

changes: add g command to grep a buffer