tc-error

tc-error is used at run time in 8 crates.

Depender (with downloads and own rev deps)			tc-error version
120	7	tcgeneric		^0.7.0
110	6	tc-value		^0.7
100	5	tc-transact		^0.7
	2	tc-btree		^0.7
	2	tc-table		^0.7
	2	tc-tensor		^0.7
	1	tc-math		^0.7
		tinychain		^0.7