Logchecker

- Remove function `searchDiffOnly`, parameter `showResults`, variables related to `showDiffColumns`
- Fix bug: update `ValueKeys` considering `filterColumns` when using filters
- Update `GENERAL_TEMPL_LINES`
- Add total time to run

- When reading the parsgin textFSM templates, whenever a variable is identified as `Required` or `Filldown`, we consider such variable as a key column to color-identify it when looking for differences.

- New parameter `ic` with default = no. If `ic` = yes, when running pre-post comparision, a new column `Idx Pre/Post` is added in the tables changes detected and major errors for specific templates, relating with the index from pre-post table. For generic templates, the column `Idx Pre/Post` is added regardless of the parameter `ic`.
- Changes in `searchDiffAll`:
- For specific template: New function `obtain_idx_pre_post` to create new column in `dfCompl`. `obtain_idx_pre_post` detects the matching index from `dfPre` (when `Where` column equal to `left_only`) or `dfPost` (when `Where` equal to `right_only`);
- For `general.template`: `tempComp` `level_0` renamed to `Idx Pre/Post`.
- `findMajor`: `reset_index` to maintain the standard with the other tables (pre-post side by side and changes detected).

- Fix bug for assessment (only using -pre)

- Creation of `diff_colors`, within `constructExcel`.
- Equivalent lines (pre-post pair) are compared, and the cells that have different values are highlighted in red.
- Borders were added to the line pairs to make it easier to immediately identify which line corresponds to the "pre" and its "paired" post line.
- Added the option to create Keys in the templates to activate the `diff_colors` function in the "changes detected" table.
- `ValueKeys` was added to the default template.

- New function `mixAll()` in order to clean up the code.