Support floating point variables when listing Basic files

[ColinPitrat]

This patch fixes an issue that occurs when listing Basic files that use floating point variables (suffixed with a !).

[ColinPitrat]

I added the second commit by mistake (I should have done a different pull-request). Tell me if you prefer a pull request with only the first patch, or if you want me to update something on the second one (the name of the option or the default behaviour) !

I choose to change the default behaviour and make splitting the long lines the option for two reasons:

• I find it odd to split lines in basic, in particular I think we should aim for exporting / importing the basic file work without any manual change needed (this is not the case yet)
• We can imagine choosing the line length in the future in which case an option is needed (but this time with a parameter)

[pulkomandy]

Thanks!