renamed tests to accomodate new naming scheme
improved test/common.vim (new features)

 * EVLibTest_Start(): added support for showing the source file name for
    a particular test "suite";
 * EVLibTest_Do_Batch():
  * improved usability: added support for command execution without
     having to use the "dictionary" way (start the expression with ':'
     for it to be considered a command);
 * minor improvements to expressions for checking library initialisation
    (before and after initialisation);
 * new function EVLibTest_GroupSet_LoadLibrary_Custom() (refactored from
    EVLibTest_GroupSet_LoadLibrary_Method_Source());
updated tests: more concise test elements; new files;

 * split 'test/vimrc_00_selftest-ex-local-nopass.vim' into two: the same
    file and 'test/vimrc_01_selftest-ex-local-pass.vim';
 * updated all test scripts to use the new "source file reporting" in
   'test/common.vim' (variable g:evlib_test_common_main_source_file);
 * updated all test scripts to use the new improved list format with
    "command" support (see previous commit in 'test/common.vim');
 * new test file: 'test/vimrc_04_init_runtimepath_auto-ex-local-pass.vim'
    to test installations in a directory reachable through
    'runtimepath';