Fix compatibility with old versions of gcc and clang

Avoiding missing-braces error wich is apparently a GCC bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119)

+ do not left shift a negative int(undefined behaviour in C standard)
+ update test patterns

It indicates that the library is not going to modify input data. This helps
using the library in C++ projects, where const is essential.

Thanks Frederic Boiteux

Add missing install location for cmake config file

See merge request BC/public/bcg729!9

Fix/infofiles

See merge request BC/public/bcg729!8

Set new urls.

See merge request BC/public/bcg729!5

Pr/github

See merge request BC/public/bcg729!4

Not all such systems have it in /opt/local/bin.

Avoid exposing unexported symbols, matches autotools behavior.

added chmod to give exec rights on shared libs for ubuntu packaging

See merge request BC/public/bcg729!3

chore(build): do not set CMAKE_INSTALL_LIBDIR and never with _libdir!

See merge request BC/public/bcg729!2

Generate RPM specfile only when targeting Linux platform.

See merge request BC/public/bcg729!1

thanks manisandro

if tests fail please delete the test/pattern directory this will trigger
the download of updated patterns

While calculation the best pitch delay (bestIntPitchDelay) the lower bounds of range was not calculated correctly near the maximun range.

codebookqLSF check started on index 1 instead of index 0