Return listbox's as rendered at server side (until we can render it client side with all features).
When tab changes preserve URL arguments in browser location bar and change only hash part.
Make basics of RelationStringField.
Improve rendering of ERP5 form's left and right fieldsets.

See commit 1472c7e9

Also remove deprecated 'methods' Product attribute.

User require.js to load dependencies.
Allow tabs to be switched using dynamic hashable routes.

Add portal type selection for search box.

remove useless commented code
improve method comments

the separator was not properly taken into account, also we want to give
priority to argument that is passed

Fix various part of bad javascript code and use CSS classes rather than hard coded styles.