Adding raw I/O capabilities for non integral types and signed integers.

[rolanddenis]

E.g. works with double or int using exportRaw and importRaw methods.

Note: in the writer, put accept a std::ostream::char_type which is, by default, a char. So, I don't understand why the conversion from an unsigned char don't not lead to a bug ...

[dcoeurjo]

Tricky bugfix, thanks.
Could you please add a small unit test (eg to check that no warning are raised on Travis bots when using the class) ?

[rolanddenis]

Done. I have added writer test in the reader test file.

[dcoeurjo]

code cleanup ?

[dcoeurjo]

thanks for the test. I only have a minor comment

[rolanddenis]

Done ;)

[dcoeurjo]

Thanks
Oops I forgot something: could you please update the module documentation page ?

[rolanddenis]

Added.

[dcoeurjo]

In I meant moduleIO.dox page :)

[rolanddenis]

Haa ok. Should I also update GenericReader and GenericWriter to allow I/O on any type ? Currently, only 8bits and 32bits raw file are supported.

[dcoeurjo]

I don't know for GenericWriter/Reader since the extension is used to switch between formats (with implicit cast if the Image value type is not the same).

[rolanddenis]

It seems that the extension is always "raw" and that the value type if deduced from the Image::Value type. I'll give it a try ;)

[rolanddenis]

Done. I have also fixed some bugs in GenericReader/Writer. By the way, those files are not very understandable and it is not clear whether the same ( file format, value type ) pairs are supported by both classes.

With C++11, it is possible to simplify this by using functor return or parameter type to set the file value type.

[dcoeurjo]

Thanks a lot.
Merging