Feature object registry search

@andy, @Mattijs - okay with naming and functionality?

Skype with Andy

• rename foundIOobject() to found().
• findIOobject() could be called findObject() in a non-templated form, but this would open up too many possibilities of accidental usage if someone forgets to add template parameters. Eg,

auto* ptr = obr.findObject("xxx");

vs
auto* ptr = obr.findObject<volScalarField>("xxx");

better to retain distinct names.

added 3 commits

• 9d813d04...9e38e143 - 2 commits from branch develop
• 1a8ecfd1 - ENH: refactored regIOobject searching in object registry

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added 5 commits

• 1a8ecfd1...3543f3ff - 3 commits from branch develop
• 290fb8fa - ENH: support objectRegistry::checkOut() by name
• ab1b363b - ENH: refactored regIOobject searching in object registry

Compare with previous version

added 1 commit

• 1b4f919b - ENH: refactored regIOobject searching in object registry

Compare with previous version

added 3 commits

• cb0a2636 - ENH: support objectRegistry::checkOut(const word& name)
• 8327e196 - ENH: refactored regIOobject searching in object registry
• 0ada4c9c - CONFIG: bump API version number to 1901 to register recent changes

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unmarked as a Work In Progress

merged