error fixed (switching to the read only mode).
Added read only mode of transactions log handler.


storage/maria/ha_maria.cc:
  Transaction log initialization parameters change.
storage/maria/ma_check.c:
  New status variable of transactional log.
storage/maria/ma_create.c:
  New status variable of transactional log.
storage/maria/ma_loghandler.c:
  - New status variable added.
  - Checking the status variable in the loghandler
  interface functions added
  - All fails of loghandler functions revised.
  - UNRECOVERABLE_ERROR() removed.
  - Switching to read only mode added where it nead.
  - Checking of log state added before writes log content
    and changing status variables like sent_to_file, n_buffers_only, flushed.
  - Readonly loghandler initialization added.
  - Fixed problem with example table transactional log initialization.
storage/maria/ma_loghandler.h:
  Readonly loghandler initialization added.
  Fixed problem with example table transactional log initialization.
  New status variable added.
storage/maria/ma_open.c:
  New status variable of transactional log.
storage/maria/ma_test1.c:
  Transaction log initialization parameters change.
storage/maria/ma_test2.c:
  Transaction log initialization parameters change.
storage/maria/maria_read_log.c:
  Transaction loghandler initialization in read only mode in
  case of only dysplay parameter.
storage/maria/unittest/Makefile.am:
  Test of readonly mode added.
storage/maria/unittest/ma_test_loghandler-t.c:
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.
  Fixed incorrect fprintf call parameters.
storage/maria/unittest/ma_test_loghandler_first_lsn-t.c:
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.
storage/maria/unittest/ma_test_loghandler_max_lsn-t.c:
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.
storage/maria/unittest/ma_test_loghandler_multigroup-t.c:
  Useing this test also as read only loghandler test.
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.
storage/maria/unittest/ma_test_loghandler_multithread-t.c:
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.
storage/maria/unittest/ma_test_loghandler_noflush-t.c:
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.
storage/maria/unittest/ma_test_loghandler_pagecache-t.c:
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.
storage/maria/unittest/ma_test_loghandler_purge-t.c:
  Transaction log initialization parameters change.
  Fixed problem with example table transactional log initialization.