Api changes :
- removeLastPathElement do not takes extra arguments
`removePreSeparator` and `removePostSeparator`.
This is not needed as path do not need special tailing separator.
- Only one function `split`. Arguments can be implicitly convert to
string. No need for overloading functions to explicitly cast them.
- `split` function takes another argument `trimEmpty`. If true, empty
element are removed.
Path manipulation now almost pass trough a vector<string> to store each
path's part.
Most of the complex works is now made in the normalizeParts function.
Instead of having a single method `listBooksIds` that tries to be
exhaustive about all the filter and sort option, split the method in
two separated methods `filter` and `sort`.
The `filter` method takes a `Filter` object that represent on what we are
filtering. This object has to be construct before calling `filter`.
```cpp
Filter filter;
filter.query("Astring");
filter.acceptTags({"nopic"});
// return all book in eng and with "Astring" in the tile or description".
library.filter(filter);
//equivalent to
library.listBooksIds(ALL, UNSORTED, "Astring", "", "", "", {"nopic"});
// or better
library.filter(Filter().query("Astring").acceptTags({"nopic"}));
```
The method `listBooksIds` has been marked as deprecated.
Add a small test on the library.
luddens
Matthieu Gautier