relaxmike

Update of m_vstring and first release of m_vstringlist.

Update of file manipulations module. New features :

Updated m_vstring with string classes "vstring_is" and vstring_join.

Update of m_vstring and first release of m_vstringlist.

Use -fnobackslash to prevent backslash substitution in the sources.

Separated m_assert and m_exception for clarity of the services provided.

Added osstring and platformstring

Small comments in filedir_error.