updated install part of README.txt
"indexing=" now use "label" instead of "values", for clarity (old
"values" still accepted for back-compatibility)
use copy.deepcopy by default for copies
use bottleneck in transforms when installed
amend to previous commit
cleaned up decorators
cleaned up and sped up summary_nc
remove the dimensions: line in dimarray display => update documentation
and docstrings accordingly
added a Talks section to the doc, removed "examples" from the main
folder
Merge branch 'display'