Feature: rename/suppress path root

I love the text summary output, but it doesn't work so well with 2 cases I run into frequently.

super long package names

------------------------------------------|----------|----------|----------|----------|----------------|
File                                      |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
------------------------------------------|----------|----------|----------|----------|----------------|
All files                                 |    94.23 |    77.42 |    88.89 |    94.23 |                |
 framework-prefixed-long-package-name     |       95 |       75 |      100 |       95 |                |
  index.js                                |       95 |       75 |      100 |       95 |             25 |
 framework-prefixed-long-package-name/lib |    93.75 |    78.95 |    85.71 |    93.75 |                |
  tunnel.js                               |    93.75 |    78.95 |    85.71 |    93.75 |          37,53 |
------------------------------------------|----------|----------|----------|----------|----------------|

paths that are hash package name and environment (CI)

----------------|----------|----------|----------|----------|----------------|
File            |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
----------------|----------|----------|----------|----------|----------------|
All files       |    94.23 |    77.42 |    88.89 |    94.23 |                |
 abcdef0123     |       95 |       75 |      100 |       95 |                |
  index.js      |       95 |       75 |      100 |       95 |             25 |
 abcdef0123/lib |    93.75 |    78.95 |    85.71 |    93.75 |                |
  tunnel.js     |    93.75 |    78.95 |    85.71 |    93.75 |          37,53 |
----------------|----------|----------|----------|----------|----------------|

I'm not sure why the paths are reported relative to .. instead of ., but it would be nice if that could be overridden.