[Fix] Filtering fix: Page scroll gets reset to zero, when filter text is changed
[Fix] selectFirst() and selectLast() should adjust scrolling
[Refactor/Fix] Improved flow of information between mod_filterCUs and mod_CUsMgr. Improved `updateCUsAndRelatedState`.

- These changes small fix issues related to filtering, handling dom changes etc
Merge branch 'master' of https://github.com/MakeBetter/Units