Inconsistent use of paths

[oruebel]

Different parts of the code assume path names with ending "/" and without ending "/". For example, DynamicTable assumes that it's path ends with "/"

aqnwb/src/nwb/file/ElectrodeTable.hpp

Lines 89 to 90 in 5c37c40

	inline const static std::string electrodeTablePath =
	"/general/extracellular_ephys/electrodes/";

aqnwb/src/nwb/hdmf/table/DynamicTable.cpp

Line 45 in 5c37c40

path + name, "hdmf-common", "VectorData", colDescription);

aqnwb/src/nwb/hdmf/table/DynamicTable.cpp

Line 58 in 5c37c40

path + "id", "hdmf-common", "ElementIdentifiers");

aqnwb/src/nwb/hdmf/table/DynamicTable.cpp

Line 71 in 5c37c40

path + name, "hdmf-common", "VectorData", colDescription);

However, other Containers assume that path names do not have a "/" at the end, e.g., here:

aqnwb/src/nwb/base/TimeSeries.cpp

Line 51 in 5c37c40

this->timestampsType, tsDsetSize, chunkSize, getPath() + "/timestamps"));

In particular, all of these use the same variable "Container::path" that they inherit from "Container".

To avoid errors and ease use of the API, I propose to:

1. Always use paths without ending "/"
2. In the constructor of Container remove trailing "/" from the path
3. Update DynamicTable and ElectrodeTable to not assume trailing "/"
4. Add utility function for merging paths to account for trailing and non-trailing spaces