dont set geschaeftsjahr_max by default
coding style
configurable width of dropdowns; markup inactive buttons in selector_int()
set reasonable max years in year selectors
increase max width in dropdown elements
new: saldenlist_view()
add info messages
rename deprecate long options
input fields only iff $flag_editable; display button only with sufficient privileges
{haupt,unter}konto.php: handle year and show useful lists (as year is now in buchung, not unterkonto)