Fixing join table aliases mismatch

This fix makes the join aliases generated under _buildQuery() match the aliases generated under _makeJoinAliases() (as it does  for J2.5/F3.0 as well). The mismatching in numeration used in aliases occurred when one table was used twice or more times as joined table. Example:

xtest_manytoone_one was used 3 times as joined table (different "from" tables); 
when in the __pkval part of the query its aliases were 
xtest_manytoone_one_0.id AS __pk_val2, 
xtest_manytoone_one_1.id AS __pk_val3, 
xtest_manytoone_one_2.id AS __pk_val4,

then in "LEFT JOIN" part its aliases were
LEFT JOIN xtest_manytoone_one AS xtest_manytoone_one 
ON xtest_manytoone_one.xtest_manytoone_main_id = xtest_manytoone_main.id 
LEFT JOIN xtest_manytoone_one AS xtest_manytoone_one_0 
ON xtest_manytoone_one_0.xtest_manytoone_1_id = xtest_manytoone_1.id 
LEFT JOIN xtest_manytoone_one AS xtest_manytoone_one_1 
ON xtest_manytoone_one_1.xtest_manytoone_3_id = xtest_manytoone_3.id

and instead displaying list the sql error was displayed as xtest_manytoone_one_2 didn't actually exist.

This change DOESN'T fix another issue that when one table was joined many times then no all joined data is displayed. The "daisy chain" table joins seems not to working yet in J3/F3.1 but in J2.5/F3.0 another list and form with "daisy chain" table joins works like earlier (there just each joined table is used once, like usually).
Merge branch 'patch-33' into joomla3