Upgrade: Create a "database" factory class to migrate database subsystem to 2.0

(from [5b69eade623383a843516ed78fc3005cc16ba3e4]) [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] Add PHPDoc comments to some base files. Fix some parameters in the eLog function. for PHPDoc type of database to msqli_database since it's the only one we use at this point. https://github.com/exponentcms/exponent-cms/commit/5b69eade623383a8...

(from [94c598a2a707f7c1ca8efe9a295cc3c9ec6ad076]) Remove foreign calls from database engines (MySql in PG, MySql in MySqlI, etc...) Keep things pure by using DB specific call in that engine (only minor changes) [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/94c598a2a707f7c1...

(from [9da5733358966ce4591d4691fbd8b8d940bbfbf1]) Changes mysql_error calls to mysqli_error calls (interim measure) [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/9da5733358966ce4...

(from [3ed564b4e1a345521534ef3d0747393480290b0f]) Changes mysql_escape_string calls to ...real_escape_string function with condition call based on db engine [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/3ed564b4e1a34552...

(from [c236d0875adb97fec8b322e7835f410610bc4ce3]) Changes mysqli_error() calls to $db->error() to pass details to selected db engine [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/c236d0875adb97fe...

(from [6e7ec235fe5ca3aa10e29b8c3e2caab8c769c1b8]) Changes another mysqli_error() calls in installation to $db->error() to pass details to selected db engine [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/6e7ec235fe5ca3aa...

(from [0b2dbe143aea207cdbf3afc8f2d5ebd9a484d422]) Abstracts mysqli_real_escape_string into the database engine as "escapeString" function to allow for future expansion of database engines. [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/0b2dbe143aea207c...

(from [d2d028391139381728b490ebe98975308da37ede]) Initial conversion of database subsystem to 2.0 format [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/d2d0283911393817...

(from [9ed744cf029b23682dfd90fe27b4b5326d2c6353]) Actually the database subsystem migration to 2.0 requires the files (duh!) [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/9ed744cf029b2368...

(from [c3ee4abaaee7f20fc7ceecd001a60f0f894a6d58]) Tweaks to new 2.0 expDatabase subsystems and drivers, also deletes old database subsystem and drivers [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/c3ee4abaaee7f20f...

(from [bfcf017194253f1fa7a19f158c7b321ba99f9bb0]) More tweaks to new 2.0 expDatabase subsystem, also moves database abstract class into expDatabase [#198 Upgrade: Create a "database" factory class to migrate database subsystem to 2.0] https://github.com/exponentcms/exponent-cms/commit/bfcf017194253f1f...