Update tests for the physics package and update code

[dpvc]

This PR updates the pyhsics tests, and adjusts the PhysicsMethods.ts file:

• Lines 286-289 are never reached because on line 245, if arg is true and next is not an open brace, an error is thrown. So to get this far, we know arg is false or next is an open brace. Since 28 checks for arg being true, that would only occur if next is an open brace. But in that case, the condition for line 271 will be true, and that block ends with a return. So lines 287-288 can never be reached.
• In original line 714, starKet can only be true if hasKet is true, but the if at original line 707 means that hasKet must be false for line 714, and so starKet is false, and the || starKet is superfluous.
• Lines 1046-1049 are not needed. This is because endI is the string index for the character that follows the argument found by the GetArgument() call on original line 1032, and because original line 1028 guarantees that the argument starts with a brace, this means that endI is after the closing brace. Note that parser.i changes in the loop only by the GetUpTo() on line 1040 succeeds, and that only happens when it finds a ,. that would put parser.i just after that, so it is at most pointing to the closing brace, and endI is after that, so parser.i is never greater-than-or-equal-to endI on line 1046. So I removed that block.

[zorkow]

lgtm.