file name handling in CsvLoader

[Nicolas-Masson-Wizaplace]

The CsvLoader append fileCounter and the .csv file extension, in any case (using the linePerFile option or not).

We force the class consumers to feed an incomplete file path.
Ex.: input file name: /path/to/my/file produce:

• /path/to/my/file_0.csv
• /path/to/my/file_1.csv
• /path/to/my/file_2.csv

In order to let the CsvLoader class consumers having full control of the file path, i suggest to make 0 silent in the file name generation, and to use pathinfo for the file name extension extraction.

Ex.: input file name: /path/to/my/file.csv will produce:

• /path/to/my/file.csv
• /path/to/my/file_1.csv
• /path/to/my/file_2.csv

And/Or using the linePerFile option to activate or not this first _0 file name suffix.