made the api doc better, also replaced SQL with {}. i have also remove bcms::wizard_step and bcms::init_bcms as they are bcms-ui-wizard spe…
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made the api doc better, also replaced SQL with {}. i have also remove bcms::wizard_step and bcms::init_bcms as they are bcms-ui-wizard specific. i have also moved out bcms::register_content_type and bcms::is_registered_content_type and now moved to bcms::folder name space
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