All dialogs get the "Qt::WindowModal" modality to
operate the Help window in parallel
while also blocking the dialog parent windows.
The manageRevocations() moved from model to view
The Details dialogs become more self-sufficient.
There is a statc start method that shows the dialog and
updates name and comment after accept().
This allows recursive starts of certificate details and
independence of mainwin.
It is necessary to set the current toplevel widget as parent
for the next dialog to not block the application.
The global variable "Database" of class xca_db
can be used by any other class to access. No need
to provide it.
The "xca_db" class managed the "database_model" pointer.
Accessing the name of the current database has been unified.
New classes:
- database_model: Manage the database tables (keys, req, cert, crl, templ)
extracted from widgets/MW_database.cpp
- arguments: parse commandline, dynamically create help text
