WDF/BA Updates:

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- Added database column names to $rsMAIN. Now, when no records are found, the apps can export an empty file with correct column headings.
- Replaced regular string functions by their multi-byte equivalents.

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- Added the number of activations and allowed total number of activations to the Serial Number API email response.

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- New function : mv_array_count_keys(). This function counts the number of occurrences of a specific key in a one- or multi-dimensional array.
- New function: mv_array_sum(). This functions sums each occurrence of a specific key in a one- or multi-dimensional array.
- Improved function: mv_str_starts_with().

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- GP006MNU: Added automatic filling in of a new sequence number for a new entry.
- PFD001: Added /drbd/ path to find uploaded files.

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- Added ob_clean() before exporting data to Excel or CSV.
- Various code improvemnets.