Add new argument to info fibres to enable grouping by line/stack

Adds an extra optional, numerical argument to info fibres which lets you specify how many frames "up" to inspect for similarity and group. Check for same-line cases regardless of the value of that numerical argument.

Not passing that optional parameter returns output in the same format as before.

added 3 commits

• da83c7a7 - 1 commit from branch mkarsten:master
• f8dcaf56 - Add new argument to info fibres to enable grouping by line/stack
• e99a4408 - And semantics, grouped printing, * fix

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added 5 commits

• e99a4408...d5e66ec1 - 3 commits from branch mkarsten:master
• c5e048fb - Add new argument to info fibres to enable grouping by line/stack
• 6d5ee49f - And semantics, grouped printing, * fix

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added 5 commits

• 6d5ee49f...4b02c772 - 3 commits from branch mkarsten:master
• 1d58a59e - Add new argument to info fibres to enable grouping by line/stack
• 6bc50ec1 - And semantics, grouped printing, * fix

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added 9 commits

• 6bc50ec1...ba389032 - 7 commits from branch mkarsten:master
• b1a122a5 - Add new argument to info fibres to enable grouping by line/stack
• 015468d7 - And semantics, grouped printing, * fix

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added 1 commit

• 4ad66359 - Restore all threads in inferior, not just selected one

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merged

mentioned in commit a3f403dd