[x] added tests for missing input files, wrong input types and dimensions, and columnwise data input for vm methods as of 8d00a9c1083bb1652353c4267a3269684680057c
Issue-3: Documentation
[x] package-level docs: added in a89f4e003c7cda844bd3fa0dd9cd082c8c068335
[x] function-level docs - add @return, @examples
[x] more detailed argument explanations
[x] performance and functionality comparison with dtw
[ ] Examples of practical applications
[x] guide to file/vector/matrix methods cd612f6
[x] qlength explanation
[x] figure in readme
Issue-4: Export C++ level interface
[x] C++ interface for high-level functions added in 8a8b8507