added additional aggregation functions: len, upper, lower
add operators for where conditions
custom template filter to show columns datatype class
display columns datatype
in design field show column name first then table name
minor refactoring
removed len function from aggregations
create db url using databases settings
change database using url parameter
formatting corrected
add show database 2d graph functionality
updated run command to work with matplot graph
bug: redisplay only error message and not the report for drop down