BGV_country_db_lookup example fails locating dataset

[rosielickorish]

Describe the bug
The BGV_country_db_lookup example is failing to locate the countries_dataset.csv and failing with the following error:

what():  Error: This example failed trying to open the data file: ./examples/BGV_country_db_lookup/countries_dataset.csv
              Please check this file exists and try again.

To Reproduce
Steps to reproduce the behavior:

1. Start the toolkit hit Build
2. Launch the BGV_country_db_lookup demo using the Launch button
3. See the demo start to run but then fail trying to open the data file countries_dataset.csv

Expected behavior
The demo should run successfully after the toolkit is open and the Build, then Launch buttons are hit.

Environment (please complete the following information):

• Host Info (The machine hosting the FHE Toolkit Docker container), please provide the output of running the following commands in a termina window:
  • uname - Darwin Kernel Version 19.5.0: Tue May 26 20:41:44 PDT 2020; root:xnu-6153.121.2~2/RELEASE_X86_64 x86_64
  • ulimit -a

-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8192
-c: core file size (blocks)         0
-v: address space (kbytes)          unlimited
-l: locked-in-memory size (kbytes)  unlimited
-u: processes                       2784
-n: file descriptors                10496

• Docker version (run docker -v in Terminal): Docker version 19.03.12, build 48a66213fe
• Toolkit platform (Fedora, CentOS, Ubuntu): All

Additional context
ms-vscode.cmake-tools version v1.4.2

[pparamde]

I'm hitting the same error with HPVS toolkit..

[rosielickorish]

Fix merged #41