'Return the ordered list libraries in which to search for blob
imports in this buffer.
Each "library" is an instance of a database *Lib class that
provides the has_blob()/get_blob() API. See the
database/database.py module docstring for details.
Commonly a buffer (for a typical programming language) will have
some or all of the following libs:
curdirlib/runtimedirlib
extradirslib (based on *ExtraPaths prefs in the buffer\'s env)
envlib (e.g. from PYTHONPATH, PERL5LIB, ... if set)
cataloglib
sitelib
stdlib'

@property
def libs(self):

    raise VirtualMethodError(("Buffer    subclass    for    lang    '%s'    should    implement    the    'libs'    property" % self.lang))
