move breakpoint from traceback module to util
add contextual info in traceback explorer
fix bug in refinedtopology boundary, interfaces
Merge branch 'master' of https://github.com/nutils/nutils
rename traceback to debug, fix name conflict
fix two bugs, missing references to 'exc'
fix bernstein_poly bug for degree=0
Merge branch 'master' into trilinos
fix missing subdom args in Element constructors
bugfix: import debug in plot module
Merge branch 'master' into trilinos
Merge branch 'trilinos' of https://github.com/nutils/nutils into trilinos