copied db related classes from php_lib’s class5 folder.
copied prev/next class for db pagination.
fixed many warnings/bugs reported by IDE.
removed unused methods and options.
copied html form element related classes from class5.
split files to each class; except for Codes.
Merge branch 'master' of github.com:asaokamei/Models into classes
moved old php_lib classes to Class folder.
refactored code by IDE.
reformat code by IDE.
reformat code by IDE.
remove rarely used methods.
remove rarely used methods; suppressed some warnings.
add some comments and rearranged code to put similar methods together.
fix/remove mysterious param type.
separate filters from Datum object.
require once the required Filter class.
clean up code to reduce warnings and errors.
Merge branch 'classes' of github.com:asaokamei/Models into classes
add quote methods for escaping string…
created some utility classes for files and csv files.