* Make use of `PackageUpdater` more efficient by avoiding multiple calls of
`addDepsAndProvidesFromOtherPackage`
* Fix leaving old provides in the database by splitting the update via new
`beginUpdate()` and `endUpdate()` functions
* Avoid using buildDate of PackageInfo in favor of the same field in
PackageBase
* PackageInfo::buildDate should be removed on the next breaking change
* Do not really use the deprecated attribute because it is still used by
(de)serialization code until it is removed for good
* Break backwards compatibility
* Allow to deserialize only base-data of packages and build
actions to potentially speed up showing tables
* Speed up package search in many cases by only deserializing
base-data (unless details are actually wanted)
Martchus