[web-fronted] refactoring code

For historic reason, two handlers exists, one for POST and one for GET request.
Merge these two to one GET request handler. This handler has optionally three
parameteres:

	* filter: Filters the transactions by the given regex
	* date_start: Output only transactions after this date
	* date_end: Output only transactions before this date

If more than one parameter is given, all filters must match for a transaction to
be printed.

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