The problem was that when converting a string to an exact number,
rounding didn't work, because conversion didn't understand
approximate numbers notation.
Fix: a new function for string-to-number conversion was implemented,
which is aware of approxinate number notation (with decimal point
and exponent, e.g. -19.55e-1)


include/m_ctype.h:
  Adding new function into MY_CHARSET_HANDLER
  Adding prototypes for 8bit and ucs2 functions.
mysql-test/r/loaddata.result:
  Fixing results
mysql-test/r/ps_2myisam.result:
  Fixing results
mysql-test/r/ps_3innodb.result:
  Fixing results
mysql-test/r/ps_4heap.result:
  Fixing results
mysql-test/r/ps_5merge.result:
  Fixing results
mysql-test/r/ps_6bdb.result:
  Fixing results
mysql-test/r/rpl_rewrite_db.result:
  Fixing results
mysql-test/r/select.result:
  Fixing results
mysql-test/r/sp-vars.result:
  Fixing results
mysql-test/r/strict.result:
  Fixing results
mysql-test/r/view.result:
  Fixing results
mysql-test/r/warnings.result:
  Fixing results
mysql-test/t/strict.test:
  Fixing results
sql/field.cc:
  Using new function
strings/ctype-big5.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-bin.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-cp932.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-euc_kr.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-eucjpms.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-gb2312.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-gbk.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-latin1.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-simple.c:
  Implementing my_strntoull10_8bit
  Adding new function into MY_CHARSET_HANDLER
strings/ctype-sjis.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-tis620.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-ucs2.c:
  Implementing UCS2 wrapper for 8bit version
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-ujis.c:
  Adding new function into the MY_CHARSET_HANDLER structure
strings/ctype-utf8.c:
  Adding new function into the MY_CHARSET_HANDLER structure
mysql-test/r/round.result:
  New BitKeeper file ``mysql-test/r/round.result''
mysql-test/t/round.test:
  New BitKeeper file ``mysql-test/t/round.test''