Search, Search/Replace and new column options.

[Robinm]

A) In Search, provide an option to display only those lines that satisfy the search criteria.

1. Searching for "in"
2. within these four lines.
3. Will display lines. 1,2 and 3.
4. Will not display this one.
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B) Provide a similar option for Replace. The only lines that will display are those where the replace occurred.

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C) When working in column mode, provide an option for inserts and deletes to only apply to the current column.
eg
A X C
A Y C
A Z C
If I am working in column 2, in the example above deleting "Y" should result in.
A X C
A Z C
A    C
Then positioning the cursor after "X", pressing return and entering "Q" should result in.
A X C
A Q C
A Z C
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