add skip mode to filesystem storage engine

Registered by ziminq

some times, a text file has continuous column separators, and we want to treat them as one big separator. e.g. the below table
111<space><space><space>aaa<\n>
222<space><space><space>bbb<\n>

we want it to be only two columns in most cases instead of four columns with the middle two being NULL.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
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Definition:
New
Series goal:
None
Implementation:
Implemented
Milestone target:
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Started by
ziminq
Completed by
ziminq

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there is an option named 'SEPARATOR_MODE' which completes this goal.
there are three values for it:
  * STRICT
  * GENERAL (default)
  * WEAK

(?)

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