Feature request: right-align file size column and shorten labels

[eugenesvk]

Current view: useless(ly) long 'Bytes' labels, hard to differentiate smaller numbers from bigger ones
Proposed view: right-alignment + shorter unit labels + lower case 'k' ('M' etc. left in upper case) make the column more informative and cleaner (it's still not ideal due to proportional numbers in this font and no padding to two decimals in all K+ numbers)

Current view:

Proposed view:

Draft code changes for the proposed view are in this fork
(though it also changes sizes from binary to decimal which you might not want to add (ideally this should be an configureable option))

[sungod12]

can I work on this issue? @softvar ?