EasyPopulate V4 4.0.36 ZC Release

• Correct issue with sql statements in easypopulate_4_attrib.php where the bindVars substitution did not include the full variable name to replace.
• Correct a missing comparison value in easypopulate_4_import.php related to category names and not having mb_strlen enabled/installed on destination system.
• Modify the install process to offer an "update" process thus not requiring settings to be restored as part of a software upgrade.
• Provide some further modifications to the instructions to address common issues identified/addressed in the forum. This includes specific identification of how to delete product and how to change the master category id for a product which can allow/lead to removal of linked product.
• Provide direction on how one can fully copy the attributes from one store to another, although this is not a central focus of EP4.
• Resequence some code to aide readability and future modifications including applying code consistency in areas.
• Move sections of code out of the main easypopulate_4_import.php file and into module sections.
• Update bindVars data types to correlate to the database data type such that fields that were 0 (false)/1 (true) would not be required to be included in order to use the default value. (prices identified as currency instead of a string, Boolean as integer, weights as float, dates as date instead of string, etc...)
• Remove unnecessary global variables from code flow.
• Unset variables that are no longer needed within the area of use or afterwards.