Correction in documentation

[CyrilleB79]

Following are described errors in '6pad++ configuration directives.html' or cconfusing parameter names.

For the paragraphs 'defaultAutoIndent', 'defaultSmartPaste', 'defaultSmartHome', 'defaultSafeIndent':

1. These parameters are described to apply to new files. However, since they cannot be modified individually for a file afterwards, the words 'for new files' should be removed in each paragraph. Indeed, this parameters apply the same way for all opened files in 6pad++.
2. The default value of these parameters should be indicated in the documentation, in case the user does not define explicitely these parameters.
3. The names of these parameters let us think that these are default values that could then be modified, as this is the case for indation mode that could be initialized with 'defaultIndentationMode' and then modified in the menu Format -> Indentation.

The parameter 'defaultTabWidth' should not contain 'default' in its name. Indeed, this is not a default value but a parameter that cannot be modified elsewhere. 'visualTabWitdh' would be a good name.