Fixed origin_tech in manipulator items
Fixed origin_tech in pacman circuitboard
Removed redundant origin_tech declarations

Some of them were misspelled, too.
Merged two lines with origin_tech

One used to overwrite the other.
Replaced empty string with null in origin_tech

Changed it to keep in line with what seems to be a standard.
Changed toy double saber's origin tech to null
Fixed origin_tech in lesser scroll
Fixed origin_tech in both weapons
Fixed origin_tech in experimental welding tool
Merge pull request #2 from tgstation/master

Trying to update my stuff
Merge pull request #3 from Sugarette/master

Wonder if it works
Merge pull request #2817 from Sugarette/spellcheck

Spell check of origin_tech variables in items that no one deconstructs anyway