Fixed PYTHONPATH installation instructions after directory restructur…

…e of core lava repo (lava-nc#48)

* Update README.md

Updated installation instructions of README.md to match new repo structure.

* Update tutorial01_installing_lava.ipynb

Updating PYTHONPATH installation instructions to match new dir structure of core lava repo

* Fixing PYTHONPATH in Installing Lava tutorial after directory restructure

README.md

@@ -80,9 +80,11 @@ $ git clone [email protected]:lava-nc/lava.git
 $ cd lava
 $ pip install -r build-requirements.txt
 $ pip install -r requirements.txt
-$ export PYTHONPATH=~/lava
+$ export PYTHONPATH=$(pwd)/src
 $ pyb -E unit
 ```
+Note that you should install the core Lava repository (lava) before installing other Lava libraries such as lava-optimization or lava-dl. Test your PYTHONPATH using `echo $PYTHONPATH` and ensure 'lava/src' is the first entry that precedes any additional Lava library src paths. 
+
 #### [Windows]
 ```cmd
 cd %HOMEPATH%
@@ -93,9 +95,10 @@ git clone [email protected]:lava-nc/lava.git
 cd lava
 pip install -r build-requirements.txt
 pip install -r requirements.txt
-set PYTHONPATH=%HOMEPATH%\lava
+set PYTHONPATH=%cd%\src
 pyb -E unit
 ```
+Note that you should install the core Lava repository (lava) before installing other Lava libraries such as lava-optimization or lava-dl. Test your PYTHONPATH using `echo %PYTHONPATH%` and ensure 'lava\src' is the first entry that precedes any additional Lava library src paths. 
 
 You should expect the following output after running the unit tests:
 ```

src/lava/tutorials/in_depth/tutorial01_installing_lava.ipynb

@@ -47,9 +47,11 @@
     "- cd lava\n",
     "- pip install -r build-requirements.txt\n",
     "- pip install -r requirements.txt\n",
-    "- export PYTHONPATH=~/lava\n",
+    "- export PYTHONPATH=$(pwd)/src\n",
     "- pyb -E unit\n",
     "\n",
+    "Note that you should install the core Lava repository (lava) before installing other Lava libraries such as lava-optimization or lava-dl. Test your PYTHONPATH using `echo $PYTHONPATH` and ensure 'lava/src' is the first entry that precedes any additional Lava library src paths.\n",
+    "\n",
     "#### 2.1.2 [Windows]\n",
     "- cd %HOMEPATH%\n",
     "- python3 -m venv python3_venv\n",
@@ -59,9 +61,11 @@
     "- cd lava\n",
     "- pip install -r build-requirements.txt\n",
     "- pip install -r requirements.txt\n",
-    "- set PYTHONPATH=%HOMEPATH%\\lava\n",
+    "- set PYTHONPATH=%cd%\\src\n",
     "- pyb -E unit\n",
     "\n",
+    "Note that you should install the core Lava repository (lava) before installing other Lava libraries such as lava-optimization or lava-dl. Test your PYTHONPATH using `echo %PYTHONPATH%` and ensure 'lava\\src' is the first entry that precedes any additional Lava library src paths.\n",
+    "\n",
     "You should expect the following output after running the unit tests:\n",
     "```\n",
     "PyBuilder version 0.13.3\n",
@@ -212,5 +216,5 @@
   }
  },
  "nbformat": 4,
- "nbformat_minor": 1
+ "nbformat_minor": 4
 }