delete m_pForm in Desctructor

else: memory leak?
Added "maximum_weight" and "maximum_volume" to the globalsettings

this to prepare the coming of class "KiesOphaalpunten" so the user can
choose which places to visit with the truck, and the truck better not
overload (nor in kg, nor in liters)
class KiesOphaalpunten

in class NieuweAanmelding, the user can input calls of locations that
the truck can visit on a new route. After collecting these calls, the
user can use the class KiesOphaalpunten to select those locations that
might be feasible for the next trip of the truck (keeping in mind the
maximum load of the truck)

This starts to get interesting :-)

For now, the classdoesn't make an actual connection to the database yet,
but uses dummy input (pieces of fruit, based on the example of
QListWidget). Hope to work this out further tomorrow. Good night!