CSVReader Ignores specified delimiter

[PaulARoy]

Hi there!

First of all thanks for your awesome library.
I noticed that CSVReader completely ignores the delimiter (when specified on constructor) when we use ToMatrix() or ToTable().

This is due to ReadField() forcing a GuessDelimiterFromBuffer() on initialization: 
https://github.com/accord-net/framework/blob/development/Sources/Accord.IO/Csv/CsvReader.cs#L1090
https://github.com/accord-net/framework/blob/development/Sources/Accord.IO/Csv/CsvReader.cs#L1126

This GuessDelimiterFromBuffer() should not happen if delimiter was specified from constructor.

We noticed the issue because in french the double parser expects 0,12 (instead of 0.12), but reading the matrix 0,12;0,13 separates the entries according to ',' instead of specified ';'

I can make a PR on this issue if needed.

[cesarsouza]

Hi Paul,

Thanks a lot for reporting the issue! Indeed, if you could make a PR it would be really great!

If you need further help, please ask. By the way, I also live in Grenoble, it is nice to see the framework being used so close from home :-)

Cesar

[PaulARoy]

A small world after all :)
It should not be an issue to make this PR, the solution is fairly simple.

It could be nice to meet!

[cesarsouza]

Added in release 3.6.0.