search_result_lines: improve interface

[Eike]

Improve the way how the pattern are specified.
Improve the way how the patterns are specified.
 * Let search_result_lines accept a list of strings to specify the patterns.
 * Retain the ability to specify the Patterns as Line objects.
 * Change general format of lines: 'label string: 1 2 3 hello world 4 5'
      * Label string always ends with colon ':'
      * Numbers and strings can be mixed
 * Change matching algorithm
     * Every field has its own conversion and matching algorithm.
        * Strings are matched exactly and need not to be converted
        * Numbers are converted to doubles and then compared. They must match up to a tolerance.
     * Matching and conversion algorithms for each field are automatically selected when template is
       created from a string.
     * When explicitly creating a Line object, all details can be explicitly specified:
          * expected value
          * conversion function
          * matching function
          * tolerance

- Let search_result_lines accept a list of strings to specify the patterns.
- Retain the ability to specify the Patterns as Line objects.

- Change general format of lines: 'label string: 1 2 3 hello world 4 5'
     - Label string always ends with colon ':'
     - Numbers and strings can be mixed

- Change matching algorithm
    - Every field has its own conversion and matching algorithm.
       - Strings are matched exactly and need not to be converted
       - Numbers are converted to doubles and then compared. They must match up to a tolerance.
    - Matching and conversion algorithms for each field are automatically selected when template is
      created from a string.
    - When explicitly creating a Line object, all details can be explicitly specified:
         - expected value
         - conversion function
         - matching function
         - tolerance