Store in path equivalent to the current notebook

[krassowski]

It is often useful to have the data storage structure reflect the structure of the notebooks. However, as notebooks get renamed and moved around the paths needs to be updated. I propose using dot (.) to indicate that data should be saved in the path equivalent to the currently running notebook. Runnning:

%vault store data in .

in a notebook located in analyses/main_analysis.ipynb would save the data in analyses/main_analysis path of the vault, i.e. be equivalent of running:

%vault store data in analyses/main_analysis

an alternative syntax would use double underscores, e.g.:

%vault store data in __here__

The dot syntax is more akin to the import syntax of Python (from . import x), thus slightly preferred.

The dot syntax could allow further path specification:

%vault store data_clean_1 in ./processed
%vault store data_clean_2 in ./processed
%vault store data_raw_1 in ./raw
%vault store data_raw_2 in ./raw

Support for .. could be considered too, but is outside of scope of this proposal.